I've been fighting with a few apps constantly buffering or disconnecting. HBOMax, Discovery+, Disney+ pause and buffer constantly. MyTeams NBC Sports app won't stream at all. It happens on the 2 Samsung TV's that I own. At first I thought it was the internet connection so I ran a physical network cable from the router to the TV, issue remains. I've reset the SmartHub and re-installed the apps. I've unplugged the power for 5 minutes and powered back on. I can plug my Roku into the same TV and connect it wirelessly to the same network and the Roku has no issues at all. All apps run, no buffering or app crash. I have AT&T fiber and my average internet speed is 350+ Mbps. Firmware on the TV's is set to auto update and are currently running the latest firmware pushed out by Samsung.